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if it is the same cc rating , the parts will be the same , regardless of what the other motor is in if it is a stihl ( hedger trimmer ,chainsaw etc
you have stated the same motor model so it is difficult to guess what the other motor is

Hi John...You will need to remove the bar and chain...behind the bar is the auto oiler it works on the shaft of the chainsaw, you will have to remove it and clean all the outlets for the oil to the chain.
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Bud

what brand saw? Stihl saws are made to run Stihl oil. If you are runnin other oil, the viscosity wont be the same as the pump is designed for, and the oiler may pump more then it should. The oil adjustment screw should be a single flat head set screw on the underside of your saw near the sprocket. Alot of saws are not equipped with an adjustable oiler. Professional saws and larger displacement saws will have the feature.

First thing I would try is wash out the oil tank with a little bit of diesel fuel then run some thinner oil thru it to see if it gets better . I usually leave bar and chain off when I do this.. or if it is oiling but not going down the bar check the bar oil holes.

No oiler adjustment. Sorryhttp://www.stihlusa.com/stihl_ownersmanuals/017_018_Manual.pdf
Are you using bar oil or something lighter? Stop by your local Stihl dealer (leave your saw in the car), give him a latte, and chat. He might have an idea or 2. He will not be chatty on any weekend or if there is a perspective sale in the store, HTH
Lou

The Stihl 026 PRO does have an adjustable oiler and it is located on the bottom of the saw just below the clutch drum.
Stihl also builds an 026 "Standard" without the adjustable oiler, however, the hole location for adjustment is still there.

The 026 PRO will also have a decompression valve on top of the saw to make the rope easier to pull during startup. If you have the DECO valve you should also have the adjustable oiler. Hope this helps.